Votes cast in the district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the country's electoral regions.

[3] Along with the 22nd district, it was dissolved in the Federal Electoral Institute's 2005 redistricting process because the state's population no longer warranted 23 districts.

[4] In its final form (1996–2005), the district's head town (cabecera distrital), where results from individual polling stations were gathered together and tallied, was at the city of Minatitlán in the south of the state.

[5][6] Under the previous districting scheme, in force from 1978 to 1996, it was located slightly to the west.

Its head town was at Jáltipan and it covered the municipalities of Cosoleacaque, Chinameca, Hidalgotitlán, Jáltipan de Morelos, Jesús Carranza, Oluta, Oteapan, Pajapan, San Juan Evangelista, Sayula de Alemán, Soconusco, Texistepec and Zaragoza.